MFT-20 DSB Transceiver Kit
Page 31
The MFT-20 transceiver wiring is very simple, as long as you remember that:
- For the antenna connection use a thin, RF-rated coaxial cable such as RG-174 or similar.
- If you install the tuning polyvaricon off the circuit board, you should use short and stiff wires, as the
mechanical stability is very important.
-A metal box is highly recommended.
If you use a plastic box, then it is highly recommended screen the inside
with aluminum foil or shielding screen tape.
The MFT-20 is not protected against reverse polarity!
It is a good idea is to place a diode (i.e. BY255 or larger) in parallel with the power supply input. The
cathode (the end of the diode with the printed band) goes to the positive wire. If your power supply has
short-circuit protection or has a fuse on its output, fine; otherwise, you will need to build or buy a cable
with an in-line fuse in series.
SPEAK[ER]
If you use headphones, you must join the two terminals of the connector so that you can hear the sound
through the two channels.
RX only
+VRX +V
terminals
Note that to use the receiver section alone, you must attach the + VRX terminal to the + V.
